Lamp



FIG. 1 is an isometric view of a top, front, and left side of an ornamental design for a lamp;

FIG. 2 is a front elevational view of the lamp of FIG. 1, the right side, left side, and rear elevational views of such lamp being identical thereto;

FIG. 3 is a top plan view of the lamp of FIG. 1; and,

FIG. 4 is a bottom plan view of the lamp of FIG. 1.

The subject matter shown in dashed lines is for illustrative purposes only and forms no part of the claimed invention. 

CLAIM The ornamental design for a lamp, as shown and described herein. 